Michael Brennan, M.D.
NPI 1538117049 · Physical Medicine & Rehabilitation Physician · Fairfield, CT
Enrolled with Medicare as Practitioner - Physical Medicine and Rehabilitation · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Brennan, M.D. is a Physical Medicine & Rehabilitation Physician provider in Fairfield, CT (NPI 1538117049).
Provider details
- NPI number
- 1538117049
- Entity type
- Individual
- Primary specialty
- Physical Medicine & Rehabilitation PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 032201 (CT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
435 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 358 | $88 |
| Testing for Presence of Drug, Read By Direct Observation80305 | 63 | $12 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 14 | $133 |
Typical Medicare-allowed amounts for these services range $12–$133 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 39 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Oxycodone Hcl | 974 | 142 |
| Oxycodone Hclbrand: Oxycontin | 215 | 31 |
| Morphine Sulfatebrand: Morphine Sulfate Er | 163 | 24 |
| Morphine Sulfate | 147 | 36 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 128 | 31 |
| Oxycodone Myristatebrand: Xtampza Er | 115 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$216 across 12 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-05
- Last updated
- 2007-07-08
Frequently asked questions
- What is Michael Brennan's NPI number?
- Michael Brennan's National Provider Identifier (NPI) is 1538117049, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Brennan's specialty?
- Michael Brennan is listed in the NPPES registry with a primary specialty of Physical Medicine & Rehabilitation Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Brennan located?
- Michael Brennan's practice location on file with NPPES is 140 Sherman St, Fairfield, CT 06824-5849.
- What is Michael Brennan's phone number?
- The practice phone number listed in the NPPES registry for Michael Brennan is (203) 255-3451.
- Does Michael Brennan accept Medicare?
- Michael Brennan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Brennan's NPI active?
- Yes — Michael Brennan's NPI (1538117049) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.